Hi! I also started learning English using videos and I can share a few tips that helped me. First, try to choose videos with English
화상영어 subtitles, it helps you understand pronunciation better and remember new words. Second, don't be afraid to rewind the video and watch difficult parts several times. I also found it helpful to pause and repeat out loud what is said in the video. This improves pronunciation and memorability. And one more important point - regularity.